UCheckCMD works with UCheck Premium version, no need to buy 2 different licenses.
If you have installed and registered UCheck on the same machine, it will be recognized immediately.
If you need information on how to register UCheck, please read the dedicated documentation.
If you don’t use UCheck and still need to register, the best solution for you is to use the “-register” command line parameters. Please refer to the command line reference for how to use the command line parameters.